golang ifacemethod4 代码
文件路径：/src/cmd/link/internal/ld/testdata/deadcode/ifacemethod4.go
/ Copyright 2020 The Go Authors. All rights reserved.
/ Use of this source code is governed by a BSD-style
/ license that can be found in the LICENSE file.
/ Test that a live type's method is not live even if
/ it matches an interface method, as long as the interface
/ method is not used.
package main
type T int
/go:noinline
func (T) M() {}
type I interface{ M() }
var p *T
var pp *I
func main() {
p = new(T) / use type T
pp = new(I) / use type I
*pp = *p / convert T to I, build itab
}